Conventional coaxial illumination is often used at high magnification, utilizing only the central part of the spot, thereby minimizing the impact of illumination unevenness.
When the magnification is reduced, the surrounding area of the spot (where the illumination rapidly decreases) is used.
Our recommendation:
・Using a high-magnification zoom lens for coaxial illumination in combination with a x1.5 auxiliary lens (standard equipment).
The zoom lens dial is set to 0.7
・High-magnification zoom lens for coaxial illumination with the auxiliary lens at the tip removed (x1.0).
The zoom lens dial is set to 0.7
The edges of the screen may appear slightly darker, but it is still within the practical range.
・Using a high-magnification zoom lens for coaxial illumination in combination with a x0.75 auxiliary lens.
The zoom lens dial is set to 0.7
The increase in surrounding shadows makes it difficult to use effectively.
For observing a wide area with coaxial illumination, planar light-source coaxial illumination is effective.
(However, due to its lower light intensity, it cannot be used at high magnifications.)
(Camera → Half mirror → Object of observation)
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| Coaxial light (spot) | Coaxial light (planar light source) | |
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